# Questions Asked in May 2009

## Most Popular Questions of May 2009

1. ### physics

Reggie Jackson stepped up to the plate and hit a .15 kg fast ball traveling at 36m/s, the impact caused the ball to leave his bat with a velocity of 45 m/s in the opposite direction. If the impact lasted for .002 seconds, with what force did Jackson exert

asked by chelsea on May 27, 2009
2. ### chemistry

asked by anonymous on May 2, 2009
3. ### Chemistry

SO2(g) + NO2(g) SO3(g) + NO (g) At a given temperature, analysis of an equilibrium mixture found [SO2] = 4.00 M, [NO2] = 0.500 M, [SO3] = 3.00 M, and [NO] = 2.00 M. (a) What is the new equilibrium concentration of NO when 1.50 moles of NO2 are added to the

asked by Andre on May 11, 2009
4. ### physics

You need to siphon water from a clogged sink. The sink has an area of 0.36 and is filled to a height of 4.0 . Your siphon tube rises 45 above the bottom of the sink and then descends 85 to a pail as shown in the figure. The siphon tube has a diameter of

asked by kelsi on May 21, 2009
5. ### covalent or ionic bond

Is Mercury (ii) Chloride a covalent bond or ionic?

asked by Mike on May 4, 2009
6. ### science

explain how the lack of atmosphere moisture in california's mohave desert causes a large daily temperature range.

asked by Anonymous on May 19, 2009
7. ### college

how would you go about doing this type of problem thank you You are trying to raise a bicycle wheel of mass x and radius r up over a curb of height h . To do this, you apply a horizontal force . 1. What is the least magnitude of the force that will succeed

asked by amy on May 18, 2009
8. ### Chem

How much water must be added to 500.mL of .200M HCL to produce a .150M solution? (.500mL x .200M)/.150M = .667mL Correct? A chemistry student needs 125mL f .150M NaOH solution for her experiment, but the only solution avail. is 3.00M. Describe how the

asked by Chopsticks on May 1, 2009
9. ### Math riddle

What is one problem That Rocket Scientist, Dr. Awkward, never has?

asked by Marco on May 3, 2009
10. ### Physics

A pinball machine uses a spring that is compressed 4.0 cm to launch a ball. If the spring constant is 13 N/m, what is the force on the ball at the moment the spring is released? I don't understand this I guess... Does the ball leave the spring at the

asked by HELP ME! on May 16, 2009
11. ### math

a supervisor must split 60 hours of overtime between five people. One employee must be assigned twice the number of hours as each of the other four employees. How many hours of overtime will be assigned to each employee?

asked by bev on May 18, 2009
12. ### physics imperfect spring

The force required to compress an imperfect horizontal spring an amount x is given by F= 150x+12x^3, where x is in meters and F in newtons. If the spring is compressed 2.1 m, what speed will it give to a 4.0 kg ball held against it and then released?

asked by annie on May 21, 2009
13. ### college math

A jet leaves a runway whose bearing is N26E from the control tower. After flying 4 miles, the jet turns 99 degrees and flies on a bearing of s55e for 6 miles. At that time what is the bearing from the jet from the control tower. I have no idea how to solve

asked by Jon on May 9, 2009
14. ### Algebra

In triangle PQR shown, point S (not shown)is on QR between Q and R. Give one possible value for the length of PS ...Explain your reasoning.. Triangle PQR = 13" PQ = 6" QR = 2" PR = 5" I need help in figuring this out this triangle with an equation or

asked by JAY10 on May 13, 2009
15. ### physics

A human wave. During sporting events within large, densely packed stadiums, spectators will send a wave (or pulse) around the stadium (Fig. below). As the wave reaches a group of spectators, they stand with a cheer and then sit. At any instant, the width w

asked by chirayu on May 1, 2009
16. ### Math

Why doesn't Gyro on Even Numbers When Playing Roulette?

asked by John on May 10, 2009
17. ### Physics

Two stunt drivers drive directly toward each other. At time t=0 the two cars are a distance D apart, car 1 is at rest, and car 2 is moving to the left with speed v_0. Car 1 begins to move at t=0, speeding up with a constant acceleration a_x. Car 2

asked by RJ on May 26, 2009
18. ### chemistry

How would SiO4 Lewis structure look like? Each oxygen has 1 unfilled electron, so would there be 2 double bonds? Thanks in advance.

asked by sh on May 5, 2009
19. ### math

if sin6A=cos9A, then angle A is equal to? 1 6 2 36 3 54 4 1 half

asked by Anonymous on May 20, 2009
20. ### physics

an airplane is flying in a horizontal circle at a speed of 430 km/h if its wings are tilted 40 degrees to the horizontal what is the radius of the circle in which the plane is flying? assume that the required force is provided entirely by an "aerodynamic

asked by chelsea on May 27, 2009
21. ### English

1. What do you usually do after school? I always go to an academy. I always go to my academy. I always go to our academy. I always go to the academy. (Which answer is right and commonly used?) 2. I have a father, a mother, and a sister. 3. I have Father,

asked by John on May 20, 2009
22. ### Calculus

A light is suspended at a height h above the floor. The illumination at the point P is inversely proportional to the square of the distance from the point P to the light and directly proportional to the cosine of the angle θ. How far from the floor should

asked by Dominick on May 1, 2009
23. ### Trig

The angle 2x lies in the fourth quadrant such that cos2x=8/17. 1.Which quadrant contains angle x? 2. Determine an exact value for cosx 3. What is the measure of x in radians? ---------------- I know that quadrant 4 has 2x in it, so quadrant _____ has to

asked by Halle on May 31, 2009
24. ### chemistry

Calculating Parts per million Helium gas, 3.0 x 10^-4 is dissolved in 200.0 g of water. Express this concentrartion in parts per million.

asked by tom on May 6, 2009
25. ### math

Bill Shass pays a property tax of \$3,200. In his community, the tax rate is 51 mills. What is Bill’s assessed value? (Round your answer to the nearest dollar amount. Omit the "\$" sign in your response.)

asked by anthony on May 5, 2009
26. ### math

The first ancient olympic games were held in 776 b.c. the ancient games were abolished in 393 a.d. The first modern olympics were held in 1896 a.d. a) How many years were there between the firstancient games and the year they were abolished? b) How many

asked by rebecca on May 7, 2009
27. ### Chemistry

An ion exchange process may be used to remove ions causing hardness of water. Outline how this works. 1. Ca2+ and Mg2+ are the ions that cause the hardness of water, one example of softening the water is to react the hard water with NaCO3 (Sodium

asked by Annie on May 30, 2009
28. ### Pre-Algebra

Is this correct? Which of the following best describes every parallelogram? A. a quadrilateral with only one pair of congruent sides B. a quadrilateral with only one pair of congruent angles C. a quadrilateral with both pairs of opposite sides parallel D.

asked by mysterychicken on May 26, 2009
29. ### English

I did not really understand the poem, Moon Rondeau. Here is the lyrics: "Love is a door we shall open together." So they told each other under the moon One evening when the smell of leaf mould And the beginnings of roses and potatoes Came on a wind. Late

asked by Priscilla on May 16, 2009
30. ### English

What is wrong with this sentence? Since I no longer maintain an office downtown for working on this kind of project.

asked by Anonymous on May 11, 2009
31. ### Spanish

I need help understanding how to ask/answer questions using the word 'Que'. If the question is ?Que' estudias tu'? is the correct answer: 'Yo estudio ___' and then whatever you're studying or could I simply answer 'Estudio ____' Also, in these questions,

asked by Kara on May 5, 2009

unit price 100 sheets for \$0.99 500 sheets for \$4.29 Which is a better buy?

asked by Deangelo on May 18, 2009
33. ### chemistry

I asked this question earlier that drbob explained but i still do not really understand what to do. can you please make it clearer? the average pH of healthy human blood is 7.4. how many moles of H+ ions are free in your blood. The average person has

asked by cara on May 25, 2009
34. ### chemistry help

A solution of AgNO3 contains 29.66 g of solute in 100.0 mL of solution. What is the molarity of the solution?

asked by chris on May 9, 2009
35. ### math

A bond has an average return of 6.8 percent and a standard deviation of 4.6 percent. What range of returns would you expect to see 68 percent of the time? a. 2.2 percent to 11.4 percent b. 4.6 percent to 11.4 percent c. 4.6 percent to 22.8 percent d. 11.4

asked by Emi on May 7, 2009
36. ### trig

A city averages 14 hours of daylight in June, 10 in December, 12 in both March and September. Assume that the number of hours of daylight varies sinusoidally over a period of one year. Write an expression for n, the number of hours of daylight, as a cosine

asked by Kelslie on May 4, 2009
37. ### computers networking

A firm is assigned the network part 128.171. It selects a 8-bit subnet part. a) Draw the bits for the four octets of the IP address of the first host on the first subnet. (Hint: Use Windows Calculator.) b) Convert this answer into dotted decimal notation.

asked by Nguyen on May 8, 2009
38. ### Chemistry 101

Aluminum reacts with sulfur gas to form aluminum sulfide. Initially 1.18 ml of aluminum and 2.25mol of sulfur are combined. 1. write a balanced equation? 2. what is the limiting reaction? 3. what is the theoretical yield of aluminum sulfide in moles? How

asked by Gweedo8 on May 31, 2009

Compare the pig brain to drawings of a human brain, a fish brain, and a bird brain. Can you see how the pig’s anatomy parallels human anatomy? What can you conclude about our relation to animals like pigs? Like birds? Like fish? I have not been able to

asked by sam on May 16, 2009
40. ### Chemistry

Use the drawing of a molecular orbital energy diagram for ClF to predict the bond order?

asked by gnozahs on May 4, 2009
41. ### chemistry

A sample of 300.0g of drinking wtare is found to cntain 38 mg Pb. What is this concentration in parts per million?

asked by peter on May 8, 2009

HENRY'S LAW I did the first one im not sure how to do the 2 and the 3rd question. 1. What is the Henry's law constant for CO2 at 20{C}? C=kP K=c/p = 3.70*10^-2/1.00atm= 0.037 2. What pressure is required to achieve a CO2 concentration of 6.00×10−2 at

asked by Saira on May 29, 2009
43. ### Chemistry

What is the molar solubility of PbCl2 in a solution of 0.23 M CaCl2? Ksp = 1.6 10-5 for PbCl2. idk how to do this because of the Cl2

asked by Jason on May 11, 2009
44. ### science

why are karyotypes important tools for genetics?

asked by Anonymous on May 12, 2009
45. ### Inorganic chemistry

Nitrogen dioxide reacts with carbon monoxide to produce nitrogen monoxide and carbon dioxide. NO2(g) + CO(g) ==>NO(g) + CO2(g) A proposed mechanism for this reaction is 2No2(g) = NO3(g) + NO(g) (fast,equilibrium) NO2(g) + CO(g) ==> NO2(g) + CO2(g) (slow)

asked by Steve on May 12, 2009
46. ### global

one similarity between the rule of Peter the Great of Russia and that of Akbar the great of india was that both leaders a. modernized and expanded their empires using ideas from other cultures b. introduced democratic ideas ino their political systems c.

asked by Chantel on May 31, 2009
47. ### zero cubed

What is zero cubed or zero to the third power

asked by Paul on May 1, 2009
48. ### Chemistry..

A protein subunit from an enzyme is part of a research study and needs to be characterized. A total of 0.180 g of this subunit was dissolved in enough water to produce 2.00 mL of solution. At 28C the osmotic pressure produced by the solution was 0.138 atm.

asked by Saira on May 29, 2009
49. ### Chemistry

1. What are the products to the reaction below: NH3+CH3CH2CH2Br-->? 2. Why does oxaloacetic acid has a higher Ka compared to succinic acid? 3. Which hydrogen atoms will malic lose if it ionizes completely? No ideas on any of these questions. Please help!

asked by anonymous on May 12, 2009
50. ### Chemistry

Which element has no stable isotopes? 1. (subscript)27 Co 2. (subscript)51 Sb 3. (subscript)90 Th 4. (subscript)82 Pb I believe it's either 2 or 3, but I can't decide which. I'm not sure how to go about answering this question, how can you tell which have

asked by Anonymous on May 26, 2009
51. ### english.poem.i am offering this poem

which of the following statements BEST explains why I am offering this Poem is considered a lyric poem? a. it is a simple poem that tells a story b. it is a tragic poem that teaches a lesson c. it si a short poem that expresses stron emotion d. it is a

asked by y912f on May 27, 2009
52. ### Chemistry limiting reactants

A student prepares phosphorous acid by reacting solid phosphorous triodide with water PI3+H2O-->H3PO3+HI The student needs to obtain 0.250L of phosphorous acid. (d=1.651g/mL). The procedure calls for a 45.0% excess of water and a yield of 75.0%. How much

asked by Gweedo8 on May 31, 2009
53. ### chemistry help

What ratio does molarity express?

asked by tom on May 18, 2009
54. ### physics

the relationship bwtween frequency, wavelength, and speed holds for light waves because all forms of electromagnetic radiation travel at a single speed in a vaccum. is this true?? or do different forms of electromagnetic radiation travel at different

asked by Claudia on May 17, 2009
55. ### math

a cable television firm presently serves 5000 households and charges \$20 per month. A merketing survey indicates that each decrease of \$1 in the monthly charge will result in 500 new costumers. Let R(x)denote the total monthly revenue when the monthly

asked by Anonymous on May 25, 2009
56. ### A Midsummer Night's Dream, Act 4

"The fourth act opens and ends with Bottom at center stage. What is your opinion of Bottom's character? How might he be the antithesis, or opposite, of Theseus's character?" Does anyone know how to answer the last part of the question? I didn't even

asked by Emily on May 9, 2009
57. ### Algebra I

Use A = P(1+r)^t to find the interest rate. \$2000 grows to \$2420 in 2 years. I have no idea how to go about this problem! Your help is appreciated. Thank you!!

asked by Faith on May 11, 2009
58. ### math

Henry Devine bought a new dishwasher for 320. He paid 20 down and made 10 monthly payments of 34. What actual yearly interest rate did Henry pay? using this formula r=2mI/p(n+1) i got this r=2(12)(20)/300(10+1)= but i don't know what to do next . can you

asked by joe on May 31, 2009
59. ### Chemistry

Can you tell me what the empirical formulas are for C2H6O4 N2O5 Hg2Cl2 C6H12 Thank you!

asked by Tal on May 27, 2009
60. ### physics loop

The small mass m sliding without friction along the looped track is to remain on the track at all times, even at the very top of the loop of radius r. (not unlike a roller coaster) A)In terms of the given quantities, determine the minimum release height h.

asked by annie on May 22, 2009
61. ### english[simile]

complete the simile the rock stood....

asked by santosh on May 3, 2009
62. ### english

hi, does anyone have any information on the poem "the railings' by roger mcgough. im after anything really, opinions, analysis, explanations. Thanks for any help!

asked by tim on May 4, 2009
63. ### physics spring

A glider on an air track is connected by springs to either end of the track. Both springs have the same spring constant,k , and the glider has mass M. A)Determine the frequency of the oscillation, assuming no damping, if k= 125N/m and M= 250g. (I got the

asked by annie on May 21, 2009
64. ### Spanish

Can someone help me with this please Re-write the following dialogue adding the correct form of “estar” or the gerundio of the verb (other than estar) in parenthesis to form the present progressive form. Jose: Hola María. ¿Qué ___(5)___ (ESTAR tú)

asked by Jordan on May 25, 2009
65. ### Chemistry

What happens to these physical properties as the strength of intermolecular forces increases? My answers are there as well but its not correct Increase or decrease? a) melting point - increases b) vapor pressure-increases c) boiling point- increases d)

asked by Saira on May 11, 2009
66. ### science

MY QUESTION IS: how do adaptations enable organisms to reduce competition for food and other resources? thank u please respond before 9

asked by elenny on May 13, 2009
67. ### Math

Suppose y varies directly with x and y=12 when x=6. Write an equation realting x and y. Please help, do not understand.

asked by Gaby on May 20, 2009
68. ### physics

The scale of a spring balance reading from 0 to 250N has a length of 10.0 cm. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.85 Hz. Ignoring the mass of the spring, what is the mass m of the fish? (and why the heck

asked by clueless on May 22, 2009
69. ### Chem

Calculate the expected volume of hot water that would be required to dissolve 0.15g of benzoic acid, vanillin, phthalic acid, salicyclic acid? You don't need to do all or any of them. I just need to know what formula to use and what to sub in and I can do

asked by Sam on May 25, 2009
70. ### chemistry

1. All of the following are structural isomers of CH2=CHCH2CH=CHCH3 EXCEPT a. CH2=CHCH2CH2CH=CH2 b. CH3CH=CHCH2CH=CH2 c. CH3CH=CHCH=CHCH3 d. CH2=C=CHCH2CH2CH3 Is it D? 2. Almost all of the amoino acids found in living organisms are in the L-form. L-Alanine

asked by anonymous on May 7, 2009
71. ### chem help asap

Describe how you would prepare 250.0 mL of a 0.500 M solution of NaCl by using apparatus found in a chemistry lab.

asked by brown on May 28, 2009
72. ### CHEM HELP

Predict which solvent will dissolve more of the given solute: a) Sodium Chloride in methanol (CH3OH) or in 1-propanol (CH3Ch2Ch2OH) Ans. I believe that sodium chloride would dissolve readily in methanol b) Ethylene glycol (HOCh2Ch2OH) in hexane

asked by Ashley on May 26, 2009
73. ### Math

Two points A and B are on opposite sides of a building. A surveyor selects a third point C to place a transit Point C is 47 feet from point A and 64 feet from point B. The angle ACB is 56 degrees. How far apart are points A and B?

asked by Sarah on May 3, 2009
74. ### CHemistry

My professor gave us these question in call and we solved for it in class, however im not sure how we got the answers. I dunt really understand the concept of intermolecular forces if some can please help me i have a quiz tomorrow. A. For each pair of

asked by Saira on May 12, 2009
75. ### Math

A surveyor standing 56 meters form the base of a building measures the angle to the top of the building and finds it to be 36 degrees. Thesurveyor then measures the angle to the top of the radio tower on the guilding and find that it is 47 degrees. How

asked by Sarah on May 3, 2009
76. ### science

a compound that has positive and negative ions in a regular pattern or crystal is an_______________

asked by Nick on May 14, 2009
77. ### chemistry

Solid Na2SO4 is added to a solution which is 0.014 M in Pb(NO3)2 and 0.041 M in AgNO3. Assume the volume remains constant. Ksp = 2.0 10-8 for PbSO4 and Ksp = 1.2 10-5 for Ag2SO4. (a) Which compound precipitates first? 1 PbSO4 (b) What is the concentration

asked by Andre on May 11, 2009
78. ### Chemistry

I've been given the formula NH4Br, and I want to make sure I properly separated it into cations and anions. I got NH+1 and Br-1. The only thing is I don't get why NH in the formula is NH4. Where does the four come from?

asked by Carolyn on May 31, 2009
79. ### science

What is the freezing point of a solution of 12.0 g of CCl4 dissolved in 750.0 g of benzene? The freezing point of benzene is 5.48°C; Kf is 5.12°C/m.

asked by Stephanie on May 6, 2009
80. ### chemistry

An aqueous solution with a pH of 3.00 is diluted from 2.0 L to 4.0 L. Wht is the pH of the diluted solution?

asked by j on May 5, 2009
81. ### Physics

A person makes a quantity of iced tea by mixing 500g of hot tea(c=4190J/(Kg.k) with an equal mass of ice(T=0c, L=333KJ/Kg). assume that mixture has negligible energy exchange with environment. If tea's initial temperature is 90c, then what is the

asked by sid on May 26, 2009
82. ### Shakespeare

How would I use ellipses in Shakspearean quotes? I know that after every line you put a / but I want to omit like half a speech and get to the end. How would I do this? This is what I want to use: “You call me misbeliever, cutthroat dog/ And you spit

asked by Lena on May 6, 2009
83. ### computers networking

Assume that an average SNMP response message is 100 bytes long. Assume that a manager sends 40 SNMP Get commands each second. a) What percentage of a 100 Mbps LAN link’s capacity would the resulting response traffic represent? b) What percentage of a 56

asked by Hubert on May 8, 2009
84. ### Grammar

Can someone please check if my answers are correct? Identify the verb form that correctly completes each sentence: 1.At the stroke of midnight, the fireworks ________ into the night sky. A.burst B.bursts C.bursted D.bursting A 2.Jermaine, seeing the shower

asked by mysterychicken on May 9, 2009
85. ### Chemistry

What is the molality of a solution made from 5.61 moles of KCl and 2.11 kg of water? I'm very lost on this one, could someone please help me?

asked by Alan on May 28, 2009
86. ### Math

At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 W/m^2. a) The sound

asked by Jus on May 20, 2009
87. ### History

Historians have often labeled the period after World War II the “Age of Containment” or a period of “The Great Fear.” Why do you think the end of the war ushered in such a fearful age? What were some of the internal and external factors?

asked by brooke on May 28, 2009
88. ### Chem

Sulfuric acid, H2SO4, reacts with CaF2 according to: CaF2 + H2SO4 ---> CaSO4 + 2 HF What is the minimum amount, in g, of impure H2SO4 (which is 83.5% H2SO4 by mass) that would be required to produce 16.2 g of HF when reacted with excess CaF2 ? Could

asked by rory on May 16, 2009
89. ### Geometry

In the diagram below of right triangle ACB, altitude CD intersects AB at D. If AD=3 and DB=4, find the length of CD in simplest radical form. How do I go about figuring out this problem? Please help. thanks

asked by Anonymous on May 12, 2009
90. ### science

Can you please tell me where is the sun in our galaxy? Also, some binary stars are called eclipsing binaries. Explain why this term is appropriate. (it gives a hint, saying: think about Algol as you come up with an answer.) I don't get it... Please help :)

asked by maya on May 30, 2009
91. ### physics

A cord connected at one end to a block which can slide on an inclined plane has its other end wrapped around a cylinder resting in a depression at the top of the plane as shown in the figure (Intro 1 figure) . Determine the speed of the block after it has

asked by gdfg on May 28, 2009
92. ### exponential function

An investment pays 8% interest, compounded annually. a) write an equation that expresses the amount, A, of the investment as a function of time, t, in years. b) determine how long it will take for this investment to double in value and then to triple in

asked by Jus on May 17, 2009
93. ### Inorganic chemistry

The thermochemical equation for the combustion of hexane is shown below. C6H14(g) + 19/2Os(g) ==> 6CO2(g) + 7H2O(g) Delta H = -4163kJ What is the enthalpy change for the combustion of 2.50g C6H14? 2.50 g/86g = .029 mol -4163kJ/.029 = -1.43 x 10^5kJ

asked by Steve on May 12, 2009
94. ### o-chem

So in lab, I was to oxidize 9-fluorenol to 9 fluorenone. The chemicals I used were: 100 mg. of 9-fluorenol in 6mL of acetone. 0.25 mL of glacial acetic acid and 1.2 mL of a 5.25% sodium hypochlorite solution. My question is if I attempt to oxidize

asked by struggling with o-chem on May 4, 2009
95. ### Chemistry

The question says write a reaction for the ionization of the following compound in water. Identify the acid, the base, the conjugate acid, and the conjugate base in each of them. 1. H2SO4 2. KOH 3. CH3COOH 4. NH3 5. HNO3 My guesses are: H2SO4 + H2O -> H3O+

asked by Samantha on May 31, 2009
96. ### Grammar

Identify the entire verb phrase: 1.The whole event had been secretly planned by the Wong twins. Ans- had been secretly planned 2.Hadn't you ever been to a state fair before? A.hadn't ever been B.had ever been C.had been D.hadn't been A Are these correct?

asked by mysterychicken on May 11, 2009
97. ### physics torque and shelf

When a wood shelf of mass 6.1 kg is fastened inside a slot in a vertical support, the support exerts a torque on the shelf. The board is 32cm wide by 3cm tall. the slot is 2 cm wide (3cm tall)on the lefthand side. So there are three vertical forces. A)

asked by kelsi on May 22, 2009
98. ### Math

Which ordered pair is a solution of the system of equations y=x^2-x-20 and y=3x-15? a. (-5,-30) b. (-1,-18) c. (0,5) d. (5,-1) When I solved the system of equations I got 5 and -1. What do I do next?

asked by Angie on May 17, 2009
99. ### chemistry

what mass of AgNO3 can be dissolved in 250 grams of water at 20 degrees C?

asked by Anonymous on May 19, 2009
100. ### goemetry

a wheelchair ramp has a slope of 1/10.if its rise is 5 1/2 feet,what is its run?

asked by geass on May 26, 2009